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During a study on the mortality of California sea lion ( Zalophus californianus) pups born on San Miguel Island, California in 2002, two adult female hookworms ( Uncinaria spp) were found penetrating the serosal surface of the intestinal wall and protruding into the peritoneal cavity of one pup. Documentation and a description of this unexpected finding and associated lesions are presented here. Also, adult hookworms were found in the peritoneal fluid of two other dead Z. californianus pups.